file_search.py — langchain Source File

Source Code

"""File search middleware for Anthropic text editor and memory tools.

This module provides Glob and Grep search tools that operate on files stored
in state or filesystem.
"""

from __future__ import annotations

import fnmatch
import re
from pathlib import Path, PurePosixPath
from typing import TYPE_CHECKING, Literal, cast

if TYPE_CHECKING:
    from typing import Any

from langchain.agents.middleware.types import AgentMiddleware
from langchain.tools import ToolRuntime, tool

from langchain_anthropic.middleware.anthropic_tools import AnthropicToolsState


def _expand_include_patterns(pattern: str) -> list[str] | None:
    """Expand brace patterns like `*.{py,pyi}` into a list of globs."""
    if "}" in pattern and "{" not in pattern:
        return None

    expanded: list[str] = []

    def _expand(current: str) -> None:
        start = current.find("{")
        if start == -1:
            expanded.append(current)
            return

        end = current.find("}", start)
        if end == -1:
            raise ValueError

        prefix = current[:start]
        suffix = current[end + 1 :]
        inner = current[start + 1 : end]
        if not inner:
            raise ValueError

        for option in inner.split(","):
            _expand(prefix + option + suffix)

    try:
        _expand(pattern)
    except ValueError:
        return None

    return expanded


def _is_valid_include_pattern(pattern: str) -> bool:
    """Validate glob pattern used for include filters."""
    if not pattern:
        return False
// ... (295 more lines)